Invention Grant
- Patent Title: Core taking apparatus
- Patent Title (中): 核心拍摄装置
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Application No.: US31475640Application Date: 1940-01-20
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Publication No.: US2278780APublication Date: 1942-04-07
- Inventor: HARRINGTON GEORGE G , STOKES JOHN C , EMRICK BERT R
- Applicant: REED ROLLER BIT CO
- Assignee: Reed Roller Bit Co
- Current Assignee: Reed Roller Bit Co
- Priority: US31475640 1940-01-20
- Main IPC: E21B25/04
- IPC: E21B25/04
Information query
